I don’t remember the date directly, no – but I remembered enough detail about the story to be able to look it up recently.
I was curious about why I had such vivid recall of watching that particular episode, when I otherwise can’t remember anything before Patrick Troughton’s second season, two years later. Turns out it was the day my brother was born.
I remember bits of Captain Midnight & the old Flash Gordon serials. But The Twilight Zone was my first real TV Science Fiction. It reminded me of the “adult” science fiction I was already reading. (Back then, in that context, “adult” meant “uses long words.”) I did like Star Trek.
Tom Baker was my first Doctor Who–on PBS, where many Americans first met him. I was far past childhood, but he’s still My Favorite Doctor. That’s probably why I didn’t agree with those who initially found The Latest Doctor “too silly.”
I watched Supercar and Stingray, but I went nuts over Thunderbirds.
Probably The Outer Limits when I was little, in the early '60s. But my earliest clear sci-fi memory is that I can remember seeing the premiere of *Lost in Space * when I was 5.
Twilight Zone and The Prisoner.
Obviously a womb with a view.
Twilight Zone for me. There were a number of science fiction radio dramas in the late forties, early fifties. Many of them were dramatizations of print short stories of the time. A lot of the first years of television were recreations of their radio counterparts. Were there any such of those radio S-F programs that predate TZ?
Dr Who.
If you include radio then Journey Into Space which was on the BBC Light Programme in the early 50’s . Fantastic show, and all the better for being on radio. This was because the imaginary special effects were far superior to anything you could see on film or television.
All around the same time (early '60s), I recall seeing episodes of The Twilight Zone, Outer Limits (I vaguely recall some really scary images but can’t remember much of anything else about the show) and, on Saturdays, the Gerry Anderson puppetfest Fireball XL-5, which I loved. I have clearer memories of watching the original run of Lost in Space and found the first few episodes absolutely gripping.
Kids at school were always telling me about Time Tunnel and Voyage to the Bottom of the Sea, but IIRC they were on ABC and since my Dad for some reason refused to buy an outside antenna for the TV, we couldn’t pull in one of the network’s stations clear enough to watch them.
I never forget that my first SF show (and second remembered show on TV) was Star Trek, the episode “Return of the Archons” 
I also watched Science Fiction Theater, but as that was taken by the time I saw this thread, I thought I’d go for the throat with Rocky Jones, Space Ranger (“High on a mountain top…”).
To no avail. I must sadly admit defeat and award you, sir, the Old Fart in Science Fiction medal. grrrrrrr…
(But hey, those were some good times, huh, at least when we could get around or even appreciate the cheezy effects?)
Star Trek (original series) and Thundebirds
I was very young… (maybe 4-5) and always assumed that Spock was the boss, as he was the only one not losing his cool when things went badly.
Thunderbirds… I couldn’t understand why the characters had such big lips…
Regards
FML
I was a tiny leedle thug, when Trek:TOS was in its first run.
And Mom claimed I was scared of that Salt Vampire beastie.